A method for applied to an RS having an RS CID to establish a routing path during a network entry process of an SS based on a multi-hop relay standard, the RS comprising a receiving module, a processor, a transmitting module, a memory, and a timer, the method comprising the steps of:
- receiving an RNG-RSP having an SS CID and a routing path for the SS by a path CID via the receiving module;
- updating the SS CID and the routing path into a routing table stored in the memory of the RS via the processor after receiving the RNG-RSP;
- transmitting the RNG-RSP having the SS CID by a ranging CID to the SS via the transmitting module;
- starting a timeout period via the timer after the SS CID and the routing path are updated;
- and
- receiving a dynamic service addition request (DSA-REQ) having the SS CID by the RS CID via the receiving module;
- wherein when the DSA-REQ is received in the timeout period, the SS CID and the routing path are still kept in the routing table.